Whipple transfer

[DrHoho02]

What is involved or needed in a swap from a '99 4.8L to a '02 5.3L with the Whipple system? Any computer upgrades and is the nosecone on the blower the same for both motors? Thanks. I have the Diablo already, I can get a file from James at Runninwith theDevil.

[James B.]

A computer upgrade will be required if the 2002 motor is "drive-by-wire" You can tell this if you have no throttle cable.

As for the pulley, the 5.3 needs a cmaller pulley on the supercharger than the 4.8 does. It will work with the 4.8 pulley, albeit at lower power levels.

[CoonToot]

Originally posted by James B.
As for the pulley, the 5.3 needs a cmaller pulley on the supercharger than the 4.8 does.
James,

You don't happen to know the actual sizes for the 4.8 and 5.3 STOCK pulleys, do you?

Scott F.

[James B.]

Originally posted by CoonToot
You don't happen to know the actual sizes for the 4.8 and 5.3 STOCK pulleys, do you?

No, sorry - I do not. One other thing I forgot to mention - the belt will be shorter for the 5.3.

['02 SilveradoSS]

4.8L - 4 5/8", 5.3L - 4 3/8"

[CoonToot]

Originally posted by '02 SilveradoSS
4.8L - 4 5/8", 5.3L - 4 3/8"

Thank you, sir!! I purchased my Whipple used and wanted to confirm that I had received the 5.3 the stock pulley...at 4 3/8", I do. I ahve a 4.0" pulley now, but it is still only at 7-8 lbs of boost. Appreciate the info!

Scott F.

['02 SilveradoSS]

Your welcome. Did you purchase the 4" pulley from Whipple? If you don't mind me asking, How much was it?

[1999stepside]

My 6psi pulley on my 5.3 is 4 1/4"

Kent

[CoonToot]

Originally posted by '02 SilveradoSS
Your welcome. Did you purchase the 4" pulley from Whipple? If you don't mind me asking, How much was it?

Actually, I purchased it from Dan Grant at Pacific Performance Engineering. The number is 714-985-4825. They are apparently geographically close to Whipple, but can get them to you faster and cheaper. Mine was $56 plus a somewhat steep $18 UPS charge. But for $74, what a difference!

Scott F.